Putnam finance board members on Tuesday voted to send a $36 million appropriation request to voters on April 9, followed by a referendum on April 23. If approved, the money would finance infrastructure and system upgrades at the town’s 60-year-old high school.

Planned work includes window replacement, science lab renovations and upgrades to the building’s electrical, heating and structural systems, as well as the expansion of the school’s gym. The district is also considering moving its central office, superintendent’s office, Putnam Alternative Learning system and a medical pathways unit to the building.

“And it’s key to understanding this process that there is a 73 percent state reimbursement rate on these types of projects,” said Mike Morrill, school board chairman. “Whether you have kids or not, having a vibrant school district helps everyone and raises the community.

The board also voted to use $45,000 from the town’s capital non-recurring account to place more cameras into the elementary and middle schools. The high school already possesses adequate video technology, officials said.

The school board originally requested a $60,000 appropriation for the work, but costs came in lower than expected thanks to a drop in technology prices, said Superintendent William Hull.